Not really, no – we want to avoid the “here’s an empty textbox, proceed to type whatever is on your mind” phenomenon that pervades the internet. Sometimes you want a little friction, and this is one of those cases. Otherwise you always get XCKD 386. Heck, I’m considering adding a feature that won’t let you reply at all until you’ve read enough of the discussion (assuming the discussion is of reasonable length, of course).
As a theme component someone could install on their own site, have at it!
(Also, this was discussed many times years ago, but we might have culled those old discussions by now. It’s also a great approach for chat, where typing momentary content that will disappear in the memory-hole after a day or two is kinda the objective.)